{
  "subject": "GRB 041006: GETS Optical Afterglow Observation",
  "eventId": "GRB 041006",
  "bibcode": "2004GCN..2832....1K",
  "createdOn": 1099628703000,
  "circularId": 2832,
  "submitter": "Kenzo Kinugasa at Gunma Astro. Obs/Japan  <kinugasa@astron.pref.gunma.jp>",
  "email": "kinugasa@astron.pref.gunma.jp",
  "body": "K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.)\nreport:\n\n Starting at 12:50:19 UT on 2004 October 6 (32 minutes after the burst\ntrigger), the sky area of GRB041006 (Galassi, et al. GCN 2770) was\nobserved with the GETS (0.25-m robotic telescope equipped with \nunfiltered CCD in the Gunma Astronomical Observatory). The observation \ncontinued for 6.5 hours and 30-s exposure frames were obtained.\n\n We stacked 20 original frames into a single frame and find that the\noptical afterglow (Da Costa, et al. GCN 2765) is detected in the\nstacked frames. Between 12:57 and 14:55 UT (mean epoch), we obtained\n10 independent measurements and the afterglow faded from Rc=17.8 to \nRc=18.7 by using a comparison star from Henden's calibration (GCN 2801).\n\n After 15:02 UT, intermittent clouds came to cover the field of view and\nthe afterglow was not detected."
}